linux-kernel - Re: [PATCH] perf,x86: fix kernel crash with PEBS/BTS after suspend/resume

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Message-ID: <CA+55aFwHRAiaFBZdwoYMVAUKrT7XPi99JKNMjjROFAKhgw8=4A@mail.gmail.com>
Date:	Sat, 16 Mar 2013 10:56:26 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Parag Warudkar <parag.lkml@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf,x86: fix kernel crash with PEBS/BTS after suspend/resume

On Sat, Mar 16, 2013 at 9:11 AM, Parag Warudkar <parag.lkml@...il.com> wrote:
>
> This seems to trigger a WARN_ON during suspend/resume.

Ugh, yes. It's practically harmless, but it's ugly and technically
wrong (we're using wrmsr_on_cpu() on our current cpu, but in a context
where using it on anything else would be horribly broken).

I think the attached patch should fix it. UNTESTED!

                  Linus

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